Features: 1.Produces a powerful beeping sound that is 105 decibel, which has an excellent warning effect while reversing. 2.Helps to catch other driver's and pedestrian's attention even over great distances immediately, prevent accidents . 3.It can be protective when connect the wire inversely or wrong, which is safe and reliable to use. 4.The installation is simple and does not require complicated operations, save your time and effort. 5.Adopt premium quality metal and ABS material, high hardness, anti-corrosion and durable. Specification: Item Type: Reversing Horn Material: ABS + Metal Voltage: 12V/24V Power: 5W Current: 0.2-0.4A Caliber: Approx. 120mm/4.7in Sound Level: 105db Working temperature: -40-60 Suitable for: 12V 24V universal How to Use: 1. Check the battery 2. Black wire is connected to the negative pole, red wire to the positive pole 3. Fix with screws 4. Ready to use PackageList: 1 x Reversing Horn